:root {
  --c-bg: #fbfbfa;
  --c-card: #ffffff;
  --c-text: #1a1d23;
  --c-muted: #5b6270;
  --c-border: #e5e7eb;
  --c-primary: #0f5fd6;
  --c-primary-dark: #0a3f8f;
  --radius: 12px;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
}

header.site {
  border-bottom: 1px solid var(--c-border);
  background: var(--c-card);
  position: sticky;
  top: 0;
  z-index: 10;
}
header.site .wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
header.site .brand {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--c-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}
header.site nav a {
  color: var(--c-muted);
  text-decoration: none;
  font-size: 0.95rem;
  margin-left: 20px;
}
header.site nav a:hover { color: var(--c-primary); }

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 48px 20px 64px;
}

h1 { font-size: 2rem; margin: 0 0 12px; letter-spacing: -0.01em; }
h2 { font-size: 1.3rem; margin: 40px 0 12px; }
p { color: var(--c-text); margin: 0 0 16px; }
.lede { color: var(--c-muted); font-size: 1.1rem; margin-bottom: 32px; }
.muted { color: var(--c-muted); }
small.muted { display: block; font-size: 0.85rem; }

.card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px 32px;
  margin-top: 24px;
}

.btn {
  display: inline-block;
  background: var(--c-primary);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 12px 22px;
  border-radius: 8px;
  margin-top: 8px;
}
.btn:hover { background: var(--c-primary-dark); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 28px;
}
.grid .item {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px;
}
.grid .item h3 { margin: 0 0 6px; font-size: 1.05rem; }
.grid .item p { margin: 0; color: var(--c-muted); font-size: 0.95rem; }

footer.site {
  border-top: 1px solid var(--c-border);
  padding: 28px 20px;
  text-align: center;
  color: var(--c-muted);
  font-size: 0.9rem;
}
footer.site a { color: var(--c-muted); }

@media (max-width: 480px) {
  header.site nav a { margin-left: 12px; font-size: 0.85rem; }
  .card { padding: 20px; }
}